LXR linux/drivers/acpi/acpica/dswload2.c

   1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2/******************************************************************************
   3 *
   4 * Module Name: dswload2 - Dispatcher second pass namespace load callbacks
   5 *
   6 * Copyright (C) 2000 - 2021, Intel Corp.
   7 *
   8 *****************************************************************************/
   9
  10#include <acpi/acpi.h>
  11#include "accommon.h"
  12#include "acparser.h"
  13#include "amlcode.h"
  14#include "acdispat.h"
  15#include "acinterp.h"
  16#include "acnamesp.h"
  17#include "acevents.h"
  18#ifdef ACPI_EXEC_APP
  19#include "aecommon.h"
  20#endif
  21
  22#define _COMPONENT          ACPI_DISPATCHER
  23ACPI_MODULE_NAME("dswload2")
  24
  25/*******************************************************************************
  26 *
  27 * FUNCTION:    acpi_ds_load2_begin_op
  28 *
  29 * PARAMETERS:  walk_state      - Current state of the parse tree walk
  30 *              out_op          - Where to return op if a new one is created
  31 *
  32 * RETURN:      Status
  33 *
  34 * DESCRIPTION: Descending callback used during the loading of ACPI tables.
  35 *
  36 ******************************************************************************/
  37acpi_status
  38acpi_ds_load2_begin_op(struct acpi_walk_state *walk_state,
  39                       union acpi_parse_object **out_op)
  40{
  41        union acpi_parse_object *op;
  42        struct acpi_namespace_node *node;
  43        acpi_status status;
  44        acpi_object_type object_type;
  45        char *buffer_ptr;
  46        u32 flags;
  47
  48        ACPI_FUNCTION_TRACE(ds_load2_begin_op);
  49
  50        op = walk_state->op;
  51        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Op=%p State=%p\n", op,
  52                          walk_state));
  53
  54        if (op) {
  55                if ((walk_state->control_state) &&
  56                    (walk_state->control_state->common.state ==
  57                     ACPI_CONTROL_CONDITIONAL_EXECUTING)) {
  58
  59                        /* We are executing a while loop outside of a method */
  60
  61                        status = acpi_ds_exec_begin_op(walk_state, out_op);
  62                        return_ACPI_STATUS(status);
  63                }
  64
  65                /* We only care about Namespace opcodes here */
  66
  67                if ((!(walk_state->op_info->flags & AML_NSOPCODE) &&
  68                     (walk_state->opcode != AML_INT_NAMEPATH_OP)) ||
  69                    (!(walk_state->op_info->flags & AML_NAMED))) {
  70                        return_ACPI_STATUS(AE_OK);
  71                }
  72
  73                /* Get the name we are going to enter or lookup in the namespace */
  74
  75                if (walk_state->opcode == AML_INT_NAMEPATH_OP) {
  76
  77                        /* For Namepath op, get the path string */
  78
  79                        buffer_ptr = op->common.value.string;
  80                        if (!buffer_ptr) {
  81
  82                                /* No name, just exit */
  83
  84                                return_ACPI_STATUS(AE_OK);
  85                        }
  86                } else {
  87                        /* Get name from the op */
  88
  89                        buffer_ptr = ACPI_CAST_PTR(char, &op->named.name);
  90                }
  91        } else {
  92                /* Get the namestring from the raw AML */
  93
  94                buffer_ptr =
  95                    acpi_ps_get_next_namestring(&walk_state->parser_state);
  96        }
  97
  98        /* Map the opcode into an internal object type */
  99
 100        object_type = walk_state->op_info->object_type;
 101
 102        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 103                          "State=%p Op=%p Type=%X\n", walk_state, op,
 104                          object_type));
 105
 106        switch (walk_state->opcode) {
 107        case AML_FIELD_OP:
 108        case AML_BANK_FIELD_OP:
 109        case AML_INDEX_FIELD_OP:
 110
 111                node = NULL;
 112                status = AE_OK;
 113                break;
 114
 115        case AML_INT_NAMEPATH_OP:
 116                /*
 117                 * The name_path is an object reference to an existing object.
 118                 * Don't enter the name into the namespace, but look it up
 119                 * for use later.
 120                 */
 121                status =
 122                    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 123                                   object_type, ACPI_IMODE_EXECUTE,
 124                                   ACPI_NS_SEARCH_PARENT, walk_state, &(node));
 125                break;
 126
 127        case AML_SCOPE_OP:
 128
 129                /* Special case for Scope(\) -> refers to the Root node */
 130
 131                if (op && (op->named.node == acpi_gbl_root_node)) {
 132                        node = op->named.node;
 133
 134                        status =
 135                            acpi_ds_scope_stack_push(node, object_type,
 136                                                     walk_state);
 137                        if (ACPI_FAILURE(status)) {
 138                                return_ACPI_STATUS(status);
 139                        }
 140                } else {
 141                        /*
 142                         * The Path is an object reference to an existing object.
 143                         * Don't enter the name into the namespace, but look it up
 144                         * for use later.
 145                         */
 146                        status =
 147                            acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 148                                           object_type, ACPI_IMODE_EXECUTE,
 149                                           ACPI_NS_SEARCH_PARENT, walk_state,
 150                                           &(node));
 151                        if (ACPI_FAILURE(status)) {
 152#ifdef ACPI_ASL_COMPILER
 153                                if (status == AE_NOT_FOUND) {
 154                                        status = AE_OK;
 155                                } else {
 156                                        ACPI_ERROR_NAMESPACE(walk_state->
 157                                                             scope_info,
 158                                                             buffer_ptr,
 159                                                             status);
 160                                }
 161#else
 162                                ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 163                                                     buffer_ptr, status);
 164#endif
 165                                return_ACPI_STATUS(status);
 166                        }
 167                }
 168
 169                /*
 170                 * We must check to make sure that the target is
 171                 * one of the opcodes that actually opens a scope
 172                 */
 173                switch (node->type) {
 174                case ACPI_TYPE_ANY:
 175                case ACPI_TYPE_LOCAL_SCOPE:     /* Scope */
 176                case ACPI_TYPE_DEVICE:
 177                case ACPI_TYPE_POWER:
 178                case ACPI_TYPE_PROCESSOR:
 179                case ACPI_TYPE_THERMAL:
 180
 181                        /* These are acceptable types */
 182                        break;
 183
 184                case ACPI_TYPE_INTEGER:
 185                case ACPI_TYPE_STRING:
 186                case ACPI_TYPE_BUFFER:
 187
 188                        /*
 189                         * These types we will allow, but we will change the type.
 190                         * This enables some existing code of the form:
 191                         *
 192                         *  Name (DEB, 0)
 193                         *  Scope (DEB) { ... }
 194                         */
 195                        ACPI_WARNING((AE_INFO,
 196                                      "Type override - [%4.4s] had invalid type (%s) "
 197                                      "for Scope operator, changed to type ANY",
 198                                      acpi_ut_get_node_name(node),
 199                                      acpi_ut_get_type_name(node->type)));
 200
 201                        node->type = ACPI_TYPE_ANY;
 202                        walk_state->scope_info->common.value = ACPI_TYPE_ANY;
 203                        break;
 204
 205                case ACPI_TYPE_METHOD:
 206
 207                        /*
 208                         * Allow scope change to root during execution of module-level
 209                         * code. Root is typed METHOD during this time.
 210                         */
 211                        if ((node == acpi_gbl_root_node) &&
 212                            (walk_state->
 213                             parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 214                                break;
 215                        }
 216
 217                        ACPI_FALLTHROUGH;
 218
 219                default:
 220
 221                        /* All other types are an error */
 222
 223                        ACPI_ERROR((AE_INFO,
 224                                    "Invalid type (%s) for target of "
 225                                    "Scope operator [%4.4s] (Cannot override)",
 226                                    acpi_ut_get_type_name(node->type),
 227                                    acpi_ut_get_node_name(node)));
 228
 229                        return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
 230                }
 231                break;
 232
 233        default:
 234
 235                /* All other opcodes */
 236
 237                if (op && op->common.node) {
 238
 239                        /* This op/node was previously entered into the namespace */
 240
 241                        node = op->common.node;
 242
 243                        if (acpi_ns_opens_scope(object_type)) {
 244                                status =
 245                                    acpi_ds_scope_stack_push(node, object_type,
 246                                                             walk_state);
 247                                if (ACPI_FAILURE(status)) {
 248                                        return_ACPI_STATUS(status);
 249                                }
 250                        }
 251
 252                        return_ACPI_STATUS(AE_OK);
 253                }
 254
 255                /*
 256                 * Enter the named type into the internal namespace. We enter the name
 257                 * as we go downward in the parse tree. Any necessary subobjects that
 258                 * involve arguments to the opcode must be created as we go back up the
 259                 * parse tree later.
 260                 *
 261                 * Note: Name may already exist if we are executing a deferred opcode.
 262                 */
 263                if (walk_state->deferred_node) {
 264
 265                        /* This name is already in the namespace, get the node */
 266
 267                        node = walk_state->deferred_node;
 268                        status = AE_OK;
 269                        break;
 270                }
 271
 272                flags = ACPI_NS_NO_UPSEARCH;
 273                if (walk_state->pass_number == ACPI_IMODE_EXECUTE) {
 274
 275                        /* Execution mode, node cannot already exist, node is temporary */
 276
 277                        flags |= ACPI_NS_ERROR_IF_FOUND;
 278
 279                        if (!
 280                            (walk_state->
 281                             parse_flags & ACPI_PARSE_MODULE_LEVEL)) {
 282                                flags |= ACPI_NS_TEMPORARY;
 283                        }
 284                }
 285#ifdef ACPI_ASL_COMPILER
 286
 287                /*
 288                 * Do not open a scope for AML_EXTERNAL_OP
 289                 * acpi_ns_lookup can open a new scope based on the object type
 290                 * of this op. AML_EXTERNAL_OP is a declaration rather than a
 291                 * definition. In the case that this external is a method object,
 292                 * acpi_ns_lookup will open a new scope. However, an AML_EXTERNAL_OP
 293                 * associated with the ACPI_TYPE_METHOD is a declaration, rather than
 294                 * a definition. Flags is set to avoid opening a scope for any
 295                 * AML_EXTERNAL_OP.
 296                 */
 297                if (walk_state->opcode == AML_EXTERNAL_OP) {
 298                        flags |= ACPI_NS_DONT_OPEN_SCOPE;
 299                }
 300#endif
 301
 302                /*
 303                 * For name creation opcodes, the full namepath prefix must
 304                 * exist, except for the final (new) nameseg.
 305                 */
 306                if (walk_state->op_info->flags & AML_NAMED) {
 307                        flags |= ACPI_NS_PREFIX_MUST_EXIST;
 308                }
 309
 310                /* Add new entry or lookup existing entry */
 311
 312                status =
 313                    acpi_ns_lookup(walk_state->scope_info, buffer_ptr,
 314                                   object_type, ACPI_IMODE_LOAD_PASS2, flags,
 315                                   walk_state, &node);
 316
 317                if (ACPI_SUCCESS(status) && (flags & ACPI_NS_TEMPORARY)) {
 318                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 319                                          "***New Node [%4.4s] %p is temporary\n",
 320                                          acpi_ut_get_node_name(node), node));
 321                }
 322                break;
 323        }
 324
 325        if (ACPI_FAILURE(status)) {
 326                ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 327                                     buffer_ptr, status);
 328                return_ACPI_STATUS(status);
 329        }
 330
 331        if (!op) {
 332
 333                /* Create a new op */
 334
 335                op = acpi_ps_alloc_op(walk_state->opcode, walk_state->aml);
 336                if (!op) {
 337                        return_ACPI_STATUS(AE_NO_MEMORY);
 338                }
 339
 340                /* Initialize the new op */
 341
 342                if (node) {
 343                        op->named.name = node->name.integer;
 344                }
 345                *out_op = op;
 346        }
 347
 348        /*
 349         * Put the Node in the "op" object that the parser uses, so we
 350         * can get it again quickly when this scope is closed
 351         */
 352        op->common.node = node;
 353        return_ACPI_STATUS(status);
 354}
 355
 356/*******************************************************************************
 357 *
 358 * FUNCTION:    acpi_ds_load2_end_op
 359 *
 360 * PARAMETERS:  walk_state      - Current state of the parse tree walk
 361 *
 362 * RETURN:      Status
 363 *
 364 * DESCRIPTION: Ascending callback used during the loading of the namespace,
 365 *              both control methods and everything else.
 366 *
 367 ******************************************************************************/
 368
 369acpi_status acpi_ds_load2_end_op(struct acpi_walk_state *walk_state)
 370{
 371        union acpi_parse_object *op;
 372        acpi_status status = AE_OK;
 373        acpi_object_type object_type;
 374        struct acpi_namespace_node *node;
 375        union acpi_parse_object *arg;
 376        struct acpi_namespace_node *new_node;
 377        u32 i;
 378        u8 region_space;
 379#ifdef ACPI_EXEC_APP
 380        union acpi_operand_object *obj_desc;
 381        char *namepath;
 382#endif
 383
 384        ACPI_FUNCTION_TRACE(ds_load2_end_op);
 385
 386        op = walk_state->op;
 387        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH, "Opcode [%s] Op %p State %p\n",
 388                          walk_state->op_info->name, op, walk_state));
 389
 390        /* Check if opcode had an associated namespace object */
 391
 392        if (!(walk_state->op_info->flags & AML_NSOBJECT)) {
 393                return_ACPI_STATUS(AE_OK);
 394        }
 395
 396        if (op->common.aml_opcode == AML_SCOPE_OP) {
 397                ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 398                                  "Ending scope Op=%p State=%p\n", op,
 399                                  walk_state));
 400        }
 401
 402        object_type = walk_state->op_info->object_type;
 403
 404        /*
 405         * Get the Node/name from the earlier lookup
 406         * (It was saved in the *op structure)
 407         */
 408        node = op->common.node;
 409
 410        /*
 411         * Put the Node on the object stack (Contains the ACPI Name of
 412         * this object)
 413         */
 414        walk_state->operands[0] = (void *)node;
 415        walk_state->num_operands = 1;
 416
 417        /* Pop the scope stack */
 418
 419        if (acpi_ns_opens_scope(object_type) &&
 420            (op->common.aml_opcode != AML_INT_METHODCALL_OP)) {
 421                ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 422                                  "(%s) Popping scope for Op %p\n",
 423                                  acpi_ut_get_type_name(object_type), op));
 424
 425                status = acpi_ds_scope_stack_pop(walk_state);
 426                if (ACPI_FAILURE(status)) {
 427                        goto cleanup;
 428                }
 429        }
 430
 431        /*
 432         * Named operations are as follows:
 433         *
 434         * AML_ALIAS
 435         * AML_BANKFIELD
 436         * AML_CREATEBITFIELD
 437         * AML_CREATEBYTEFIELD
 438         * AML_CREATEDWORDFIELD
 439         * AML_CREATEFIELD
 440         * AML_CREATEQWORDFIELD
 441         * AML_CREATEWORDFIELD
 442         * AML_DATA_REGION
 443         * AML_DEVICE
 444         * AML_EVENT
 445         * AML_FIELD
 446         * AML_INDEXFIELD
 447         * AML_METHOD
 448         * AML_METHODCALL
 449         * AML_MUTEX
 450         * AML_NAME
 451         * AML_NAMEDFIELD
 452         * AML_OPREGION
 453         * AML_POWERRES
 454         * AML_PROCESSOR
 455         * AML_SCOPE
 456         * AML_THERMALZONE
 457         */
 458
 459        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 460                          "Create-Load [%s] State=%p Op=%p NamedObj=%p\n",
 461                          acpi_ps_get_opcode_name(op->common.aml_opcode),
 462                          walk_state, op, node));
 463
 464        /* Decode the opcode */
 465
 466        arg = op->common.value.arg;
 467
 468        switch (walk_state->op_info->type) {
 469
 470        case AML_TYPE_CREATE_FIELD:
 471                /*
 472                 * Create the field object, but the field buffer and index must
 473                 * be evaluated later during the execution phase
 474                 */
 475                status = acpi_ds_create_buffer_field(op, walk_state);
 476                if (ACPI_FAILURE(status)) {
 477                        ACPI_EXCEPTION((AE_INFO, status,
 478                                        "CreateBufferField failure"));
 479                        goto cleanup;
 480                        }
 481                break;
 482
 483        case AML_TYPE_NAMED_FIELD:
 484                /*
 485                 * If we are executing a method, initialize the field
 486                 */
 487                if (walk_state->method_node) {
 488                        status = acpi_ds_init_field_objects(op, walk_state);
 489                }
 490
 491                switch (op->common.aml_opcode) {
 492                case AML_INDEX_FIELD_OP:
 493
 494                        status =
 495                            acpi_ds_create_index_field(op,
 496                                                       (acpi_handle)arg->common.
 497                                                       node, walk_state);
 498                        break;
 499
 500                case AML_BANK_FIELD_OP:
 501
 502                        status =
 503                            acpi_ds_create_bank_field(op, arg->common.node,
 504                                                      walk_state);
 505                        break;
 506
 507                case AML_FIELD_OP:
 508
 509                        status =
 510                            acpi_ds_create_field(op, arg->common.node,
 511                                                 walk_state);
 512                        break;
 513
 514                default:
 515
 516                        /* All NAMED_FIELD opcodes must be handled above */
 517                        break;
 518                }
 519                break;
 520
 521        case AML_TYPE_NAMED_SIMPLE:
 522
 523                status = acpi_ds_create_operands(walk_state, arg);
 524                if (ACPI_FAILURE(status)) {
 525                        goto cleanup;
 526                }
 527
 528                switch (op->common.aml_opcode) {
 529                case AML_PROCESSOR_OP:
 530
 531                        status = acpi_ex_create_processor(walk_state);
 532                        break;
 533
 534                case AML_POWER_RESOURCE_OP:
 535
 536                        status = acpi_ex_create_power_resource(walk_state);
 537                        break;
 538
 539                case AML_MUTEX_OP:
 540
 541                        status = acpi_ex_create_mutex(walk_state);
 542                        break;
 543
 544                case AML_EVENT_OP:
 545
 546                        status = acpi_ex_create_event(walk_state);
 547                        break;
 548
 549                case AML_ALIAS_OP:
 550
 551                        status = acpi_ex_create_alias(walk_state);
 552                        break;
 553
 554                default:
 555
 556                        /* Unknown opcode */
 557
 558                        status = AE_OK;
 559                        goto cleanup;
 560                }
 561
 562                /* Delete operands */
 563
 564                for (i = 1; i < walk_state->num_operands; i++) {
 565                        acpi_ut_remove_reference(walk_state->operands[i]);
 566                        walk_state->operands[i] = NULL;
 567                }
 568
 569                break;
 570
 571        case AML_TYPE_NAMED_COMPLEX:
 572
 573                switch (op->common.aml_opcode) {
 574                case AML_REGION_OP:
 575                case AML_DATA_REGION_OP:
 576
 577                        if (op->common.aml_opcode == AML_REGION_OP) {
 578                                region_space = (acpi_adr_space_type)
 579                                    ((op->common.value.arg)->common.value.
 580                                     integer);
 581                        } else {
 582                                region_space = ACPI_ADR_SPACE_DATA_TABLE;
 583                        }
 584
 585                        /*
 586                         * The op_region is not fully parsed at this time. The only valid
 587                         * argument is the space_id. (We must save the address of the
 588                         * AML of the address and length operands)
 589                         *
 590                         * If we have a valid region, initialize it. The namespace is
 591                         * unlocked at this point.
 592                         *
 593                         * Need to unlock interpreter if it is locked (if we are running
 594                         * a control method), in order to allow _REG methods to be run
 595                         * during acpi_ev_initialize_region.
 596                         */
 597                        if (walk_state->method_node) {
 598                                /*
 599                                 * Executing a method: initialize the region and unlock
 600                                 * the interpreter
 601                                 */
 602                                status = acpi_ex_create_region(op->named.data,
 603                                                               op->named.length,
 604                                                               region_space,
 605                                                               walk_state);
 606                                if (ACPI_FAILURE(status)) {
 607                                        return_ACPI_STATUS(status);
 608                                }
 609                        }
 610
 611                        status =
 612                            acpi_ev_initialize_region
 613                            (acpi_ns_get_attached_object(node));
 614                        break;
 615
 616                case AML_NAME_OP:
 617
 618                        status = acpi_ds_create_node(walk_state, node, op);
 619                        if (ACPI_FAILURE(status)) {
 620                                goto cleanup;
 621                        }
 622#ifdef ACPI_EXEC_APP
 623                        /*
 624                         * acpi_exec support for namespace initialization file (initialize
 625                         * Name opcodes in this code.)
 626                         */
 627                        namepath = acpi_ns_get_external_pathname(node);
 628                        status = ae_lookup_init_file_entry(namepath, &obj_desc);
 629                        if (ACPI_SUCCESS(status)) {
 630
 631                                /* Detach any existing object, attach new object */
 632
 633                                if (node->object) {
 634                                        acpi_ns_detach_object(node);
 635                                }
 636                                acpi_ns_attach_object(node, obj_desc,
 637                                                      obj_desc->common.type);
 638                        }
 639                        ACPI_FREE(namepath);
 640                        status = AE_OK;
 641#endif
 642                        break;
 643
 644                case AML_METHOD_OP:
 645                        /*
 646                         * method_op pkg_length name_string method_flags term_list
 647                         *
 648                         * Note: We must create the method node/object pair as soon as we
 649                         * see the method declaration. This allows later pass1 parsing
 650                         * of invocations of the method (need to know the number of
 651                         * arguments.)
 652                         */
 653                        ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 654                                          "LOADING-Method: State=%p Op=%p NamedObj=%p\n",
 655                                          walk_state, op, op->named.node));
 656
 657                        if (!acpi_ns_get_attached_object(op->named.node)) {
 658                                walk_state->operands[0] =
 659                                    ACPI_CAST_PTR(void, op->named.node);
 660                                walk_state->num_operands = 1;
 661
 662                                status =
 663                                    acpi_ds_create_operands(walk_state,
 664                                                            op->common.value.
 665                                                            arg);
 666                                if (ACPI_SUCCESS(status)) {
 667                                        status =
 668                                            acpi_ex_create_method(op->named.
 669                                                                  data,
 670                                                                  op->named.
 671                                                                  length,
 672                                                                  walk_state);
 673                                }
 674
 675                                walk_state->operands[0] = NULL;
 676                                walk_state->num_operands = 0;
 677
 678                                if (ACPI_FAILURE(status)) {
 679                                        return_ACPI_STATUS(status);
 680                                }
 681                        }
 682                        break;
 683
 684                default:
 685
 686                        /* All NAMED_COMPLEX opcodes must be handled above */
 687                        break;
 688                }
 689                break;
 690
 691        case AML_CLASS_INTERNAL:
 692
 693                /* case AML_INT_NAMEPATH_OP: */
 694                break;
 695
 696        case AML_CLASS_METHOD_CALL:
 697
 698                ACPI_DEBUG_PRINT((ACPI_DB_DISPATCH,
 699                                  "RESOLVING-MethodCall: State=%p Op=%p NamedObj=%p\n",
 700                                  walk_state, op, node));
 701
 702                /*
 703                 * Lookup the method name and save the Node
 704                 */
 705                status =
 706                    acpi_ns_lookup(walk_state->scope_info,
 707                                   arg->common.value.string, ACPI_TYPE_ANY,
 708                                   ACPI_IMODE_LOAD_PASS2,
 709                                   ACPI_NS_SEARCH_PARENT |
 710                                   ACPI_NS_DONT_OPEN_SCOPE, walk_state,
 711                                   &(new_node));
 712                if (ACPI_SUCCESS(status)) {
 713                        /*
 714                         * Make sure that what we found is indeed a method
 715                         * We didn't search for a method on purpose, to see if the name
 716                         * would resolve
 717                         */
 718                        if (new_node->type != ACPI_TYPE_METHOD) {
 719                                status = AE_AML_OPERAND_TYPE;
 720                        }
 721
 722                        /* We could put the returned object (Node) on the object stack for
 723                         * later, but for now, we will put it in the "op" object that the
 724                         * parser uses, so we can get it again at the end of this scope
 725                         */
 726                        op->common.node = new_node;
 727                } else {
 728                        ACPI_ERROR_NAMESPACE(walk_state->scope_info,
 729                                             arg->common.value.string, status);
 730                }
 731                break;
 732
 733        default:
 734
 735                break;
 736        }
 737
 738cleanup:
 739
 740        /* Remove the Node pushed at the very beginning */
 741
 742        walk_state->operands[0] = NULL;
 743        walk_state->num_operands = 0;
 744        return_ACPI_STATUS(status);
 745}
 746